Gravity keeps the planets from shooting off in to space, while the planet's momentum prevents in from falling in to the sun. When these are balanced, an orbit is achieved.
Centripetal force and Gravity
The force of gravity between the planets and the sun is what keeps the planets in their orbits. Gravity pulls the planets towards the sun, but their forward velocity keeps them moving in a circular or elliptical path around it. This balance between gravity and velocity enables the planets to stay in their orbits around the sun.
Gravity
It isn't actually a who, but a what. That what is Gravity.
The gravitational pull of the sun keeps the planets in orbits... Although some people think it is magnetism....
The forces of gravity between two masses are the cause of all orbits.
The gravitational force exerted by the Sun keeps all the planets in their orbits. This force balances the planets' tendency to move in a straight line and keeps them moving in elliptical orbits around the Sun.
gravity
Planets orbit the sun because gravity keeps them from escaping, and momentum keeps them moving forward. The orbits are elliptical, which is like an oval.
The two forces that work together to keep the planets in orbit around the sun are gravity and inertia.
The gravity of the Sun keeps the planets in their orbits. They stay in their orbits because there is no other force in the Solar System which can stop them.
The force of the Sun's gravity keeps them in their orbits.